Definitions ____________

Commands

• \newcommand
• \newenvironment
• \newtheorem
• \newfont

\newcommand

Command:

\newcommand{cmd}[args]{definition}

\newcommand{cmd}[args][default]{definition}

\renewcommand{cmd}[args]{definition}

\renewcommand{cmd}[args][default]{definition}

cmd

A command name beginning with a \. For \newcommand it must not be already defined and must not begin with \end; for \renewcommand it must already be defined.

args

An integer from 1 to 9 denoting the number of arguments of the command being defined. The default is for the command to have no arguments.

def

If this optional parameter is present, it means that the command's first argument is optional. The default value of the optional argument is def.

definition

The text to be substituted for every occurrence of cmd; a parameter of the form #n in cmd is replaced by the text of the nth argument when this substitution takes place.

\newenvironment

Command:

\newenvironment{nam}[args]{begdef}{enddef}

\newenvironment{nam}[args][default]{begdef}{enddef}

\renewenvironment{nam}[args]{begdef}{enddef}

nam

The name of the environment. For \newenvironment there must be no currently defined environment by that name, and the command \nam must be undefined. For \renewenvironment the environment must already be defined.

args

An integer from 1 to 9 denoting the number of arguments of the newly-defined environment. The default is no arguments.

default

If this is specified, the first argument is optional, and default gives the default value for that argument.

begdef

The text substituted for every occurrence of \begin{nam}; a parameter of the form #n in cmd is replaced by the text of the nth argument when this substitution takes place.

enddef

The text substituted for every occurrence of \end{nam}. It may not contain any argument parameters.

\newtheorem

Command:

\newtheorem{env_name}{caption}[within]

\newtheorem{env_name}[numbered_like]{caption}

env_name

The name of the environment to be defined. A string of letters. It must not be the name of an existing environment or counter.

caption

The text printed at the beginning of the environment, right before the number. This may simply say "Theorem", for example.

within

The name of an already defined counter, usually of a sectional unit. Provides a means of resetting the new theorem counter *within* the sectional unit.

numbered_like

The name of an already defined theorem-like environment.

The \newtheorem command may have at most one optional argument.

\newfont

Command:

\newfont{cmd}{font_name}